I don't fully understand what you mean by your version of multiplayer and I don't plan in participating, but I'm evaluating this mod for a community game on a MLP forum. I only have two players so far, though.
PROGRESS OF MY FORTRESS:
Mystery solved. When wasteland traders shown up, one of their animals died to feral ghouls. They fled the map after that, leaving lots of forbidden stuff behind them. That's why I had an extra security turret and other unaccounted-for stuff on the map. I took all of it, including some leather, cloth and anvils.
My luck run out and a series of tragedies struck my outpost. Four foals were kidnapped in rapid succession. EP Suny Days, EP Loudmounth, UP Tin Gadget and UP Abacus. They will be missed by their mothers. Plus they were pretty good stat-wise. I think they went to play outside.
As if that wasn't enough, Barrel Gauge and Plywood were found dead in a corner of my embark. One had a BB gun and a quiver with pellets. Later I saw a radscorpion on the map, but fortunately my securitron scared it away. Time to gear up into pistols and small calibre ammo, I guess. If only I had the fuel to make gunpowder, arms and armour for my security teams. Barrel Gauge was supposed to be a part of my militia. ((Stupid hunters coming to my embarks and messing with the wildlife.))
Most of those ponies, if not all of them, were new migrants. I've finally set up the dining room, so hopefully the foals will stay inside. I also disabled all hunting, trapping and fishing labours for everypony.
I have some kind of problem with my wood and finished goods stockpiles. I set up a wood stockpile for normal wood and another with wheelbarrows for salvage. They were sorted, but eventually ponies stopped filling them, with lots of both wood and salvage on the map. The problem may have something to do with the lack of wheelbarrows and orders of giving things to workshops. I've even set up a wood stockpile with default options and it doesn't work either. For now I'm waiting with using my wood till all the salvage is processed, but without a stockpile with wheelbarrows close to the salvage yard, the progress is glacial.
I've set a finished goods stockpile to accept gems, coins and most things under clay->tools/toys, such as destroyed terminals. It only has gems. I later set up a default finished goods stockpile and it immediately took all that broken glass and depleted batteries. I just don't know what went wrong.
With all those new migrants I finally set up a hospital and it worked fine. Most importantly, Splint, my CMP from embark is now healed and can resume her duties as CMP. Scalpel has medical labours enabled to help too.
The security turret I took from a cage from a dead trader brahnin doesn't seem to shoot at anything. Oh well, at least the protectron does.
Nine more migrants have arrived. I've got enough of them for now.
I finally got enough worthless remains to cremate them and got 4 ash. Nice. Three jobs like this and I'll get 4 gunpowder.
I've built a roofed building over a section of my brook, so I'll have access to clean water that won't freeze. I may later upgrade it with underground-only access and grated-over channels. I don't think I'll even bother with wells. Ponies sometimes fall into them.
I checked and I don't have any contacts with either Unity or Steel Rangers. Seems like a reasonably safe embark to me.
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SOME THOUGHTS.
I don't quite get the deal with all that broken glass. Green Glass is easily made from sand, although the broken variety doesn't need sacks and fits into the bins nicely, so is marginally better. If there was some broken clear and crystal glass too, as well as a small chance to find unbroken varieties, glass from salvage would be much more worthwhile.
Rename backpacks to saddlebags. Robots could have Targeting talismans as parts of them. Not necessarily as something you can damage in a combat, but something you need to make them and have a good chance of recovering from dismantling their remains.
Would heavy turrets that shoot something akin to balistae bolts be feasible?
I found some errors in Cutie Mark descriptions: CM "fish and rod" -> "his natural charisma..."
CM "assault rifle" -> "in his/her mouth." (Doesn't depend on gender)
CM "butterfly" -> "of nature."
Alchemy is an unused skill and it could make some sense in this mod.
I told you that empty bins would be better than all those open crates. I have an even better idea now: Make them into chests / coffers. It would make sense for this type of containers to be locked and even aluminium bins are quite heavy. I suspect that ponies are alcohol-dependent. They shouldn't be in any case. What the heck is "bonfire"?
IDEA: ZEBRA PHATZ
Zebra invisibility cloaks. Pretty rare. They grant invisibility to enemies or whatever passes for stealth in this version of DF to one pony, permanently. Zebra flight talismans. Add [FLYING] for a week... after which the pony plummets to her death. OK, maybe not the best idea.
Buffout: (Buck? Dash?) Buffs physical attributes for a week.
Dash: Lowers [SPEED] and increases agility for a week. In short, makes you faster.
(
): Makes a pony fearless for a week, but I think that implies blindness.
Mint-als: Buff mental stats for a week.
Med-X: Immune to pain for a week.
Healing potion: Stops bleeding (?) and boost healing rate for a week. Stronger variant, Restoration potion, even slowly heals nervous tissue.
Zebra crates: Chance of invisibility cloaks, flight talismans, rifles, medium ammunition, food, combat armour, coal and all kinds of chems. Chems should also be in MoP crates. If there are Griffins, they could be a part of slaver civilisation and use combat armour and rifles. Elites might have scorpion armour and AMRs.
In old MLP mod, there was a wood transmuting workshop. It turned food into wood. Please, please, please, have that as a part of your magic system. Ideally the workshop itself should be simple to build, but the reaction require a Unicorn who has learned the "Transmute plants to wood.", an Apprentice Alteration spell.
Have a look at "wizard's tower" mod.
http://www.bay12forums.com/smf/index.php?topic=59311.0 There may be something there that would make sense here.